Fantastic anime, the ending was probably the most shocking moment i've experienced with any series. Perhaps the only fault I have with it is that the characters are mostly forgettable. And the OVAs are terrible too.
This is one of my favorite shows. It's kind of crazy considering the wild things that happen at the end but to me it's one of the most realistic anime of this type (harem that's drawn in a playful way). Most of the others feature girls who want to hook up with a guy and a guy who wants to hook up with the girls... but the guy goes crazy out of his way to avoid it almost as if he is a homosexual or something. That's always been very weird to me and sets these type of shows in some bizarro fantasy world. Some of the situations are crazy (like a practicing intense making out) but the way the characters react feels like what a real high school kid would do.... which usually ends up as the most irresponsible thing to do.
The characters all start off kind of generic but their reactions to situations is what makes them interesting and very different than what you generally see. That made them stand out for me and got stronger emotional reactions of dislike or sympathy than any standard harem has ever gotten from me. I don't think i'll ever forget Makoto. He's radically different than every other guy in a harem that I've seen pre or prior to SD with the exception of White Album.